xt-sys/exectos
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Refactor MMU for multi-paging support and add 5-Level paging #16

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harraiken wants to merge 35 commits from harraiken_mm into master
pull from: harraiken_mm
merge into: xt-sys:master
Conversation 0 Commits 35 Files Changed 42 +37 -8
1 changed files with 37 additions and 8 deletions
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Showing only changes of commit 91a5db2ee4 - Show all commits

45
xtldr/modules/xtos_o/amd64/memory.c
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@ -71,19 +71,48 @@ XTCDECL
EFI_STATUS EFI_STATUS
XtpMapHardwareMemoryPool(IN PXTBL_PAGE_MAPPING PageMap) XtpMapHardwareMemoryPool(IN PXTBL_PAGE_MAPPING PageMap)
{ {
PHARDWARE_PTE PdeBase, PpeBase, PxeBase; PHARDWARE_PTE P5eBase, PdeBase, PpeBase, PxeBase;
EFI_PHYSICAL_ADDRESS Address; EFI_PHYSICAL_ADDRESS Address;
EFI_STATUS Status; EFI_STATUS Status;
/* Check page map level */ if(PageMap->PageMapLevel == 5)
if(PageMap->PageMapLevel > 4)
{ {
/* PML5 (LA57) is not supported yet */ /* Get P5E (PML5) base address */
return STATUS_EFI_UNSUPPORTED; P5eBase = (PHARDWARE_PTE)PageMap->PtePointer;
}
/* Get PXE (PML4) base address */ /* Check if P5E entry already exists */
PxeBase = ((PHARDWARE_PTE)(PageMap->PtePointer)); if(!P5eBase[(MM_HARDWARE_VA_START >> MM_P5I_SHIFT) & 0x1FF].Valid)
{
/* No valid P5E, allocate memory */
Status = XtLdrProtocol->Memory.AllocatePages(1, &Address);
if(Status != STATUS_EFI_SUCCESS)
{
/* Memory allocation failure, return error */
return Status;
}
/* Zero fill memory used by P5E */
RtlZeroMemory((PVOID)Address, EFI_PAGE_SIZE);
/* Make P5E valid */
P5eBase[(MM_HARDWARE_VA_START >> MM_P5I_SHIFT) & 0x1FF].Valid = 1;
P5eBase[(MM_HARDWARE_VA_START >> MM_P5I_SHIFT) & 0x1FF].PageFrameNumber = Address / EFI_PAGE_SIZE;
P5eBase[(MM_HARDWARE_VA_START >> MM_P5I_SHIFT) & 0x1FF].Writable = 1;
/* Set PXE base address */
PxeBase = (PHARDWARE_PTE)(UINT_PTR)Address;
}
else
{
/* Set PXE base address based on existing P5E */
PxeBase = (PHARDWARE_PTE)((P5eBase[(MM_HARDWARE_VA_START >> MM_P5I_SHIFT) & 0x1FF].PageFrameNumber) << EFI_PAGE_SHIFT);
}
}
else
{
/* Get PXE (PML4) base address */
PxeBase = (PHARDWARE_PTE)PageMap->PtePointer;
}
/* Check if PXE entry already exists */ /* Check if PXE entry already exists */
if(!PxeBase[(MM_HARDWARE_VA_START >> MM_PXI_SHIFT) & 0x1FF].Valid) if(!PxeBase[(MM_HARDWARE_VA_START >> MM_PXI_SHIFT) & 0x1FF].Valid)